Sound transmitter and receiver.



N0. 768,5?(1. PATENTED AUG.

- A. J. MUNDY.

. SOUND TRANSMITTER AND RECEIVER.

- APPLICATION FILED' APR. 23, 1902. NO MODEL.

WITH 555 125: I I v IV I I 1 PATENTEDAUG.

7 A. J. MUNDY. SOUND TRANSMITTER AND RECEIVER.

APYLIGATIOK PIL'EL APR. 23, 1902.

2 SHEET H0 MODEL- WITNESSES;

Patented iAug'ust 23 U ITED STATES PATENT OFFICE ARTHUR J. MUNDY, or BOSTON, amssaonussrrs, ASSIGIYOR TO s1 RINE SIGNAL COMPANY, or WATEBVILLE, MAINE, A. comes.

' jury.

'fectiveness of the instrument.

OF MAINE; 1

SOUND TRANSMITTER AND. REOEiVER.

SPECIFICATION forming part of Letters Patent No. 768,570, dated August 23, 19(

Application filed April 23, 1902. Serial No. 104,299. (No model.)

To all whmn it pu concern.-

' Receivers, of which the following is a full,

clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

My present invention relates to submerged means for receiving sound -vibrations im parted at adistance to the water in which said means is submerged and transmitted by such water to said receiving means.

It has heretofore been believed that to obtain firstclass results the diaphragm of the receiving-transmitter should be in direct contact with the open water or medium by which the sound was being transmitted and that the interposition of anything between the diaphragm and the open water impaired the ef- The efforts made in the past, however, to maintain the transmitter in contact with the transmitting medium have necessitated the adoption of apparatus ha ving inconveniences and faults commens'uable to those sought to be avoided. Delicate receiving instruments have been suspended directly in the open sea or have been mounted in the sides of ships and other vessels; the unprotected diaphragm being in all such instances liable to damage from floating and other obstacles and other sources of in- Moreover, such apparatus when used in connection with ships presents when suspended from the ship the additional diificulty of keeping it submerged when the ship is moving or in flowing tides or currents, or when mounted in the side of the ship the difficulty of securing clear signals owing-to the interfering noises created on shipboard and conveyed to the transmitter through the shell of the ship.

l have discovered that it is possible to in case the transmitter without injuriously at footing its responsiveness to sound-waves and by the shell of the casing to protect damage from exterior agencies. The a ship may constitute a portion of sucl tecting-shell and the ship, in such hr the casing itself. In such case I prm the use of a'transmitter entirely wit ship, this being my preferred const when'my invention is used on shipboz I have discovered that although em sound-waves is ordinarily lost in passir one medium to another, yet it is pos: interpose between the receiving-dia andthe source of sound a prozectingc shell, provided that the continuity of th mitting medium is otherwise substanti: brokenthat is to say, the medium said interposed casing be of similar. na that without, then, as a a matter of fac is no material change in the trans] medium, and consequently no material energy in the transmission. Actual mentation and use have demonstrated t interposed shell apparently does not in with the passage of the waves througl delivers to the liquid upon one side 1 substantially the impulses received fr water on the other side.

In the location of the transmitter upo board there is employed within the sh? preferably against the side thereof,: the shell or side of the ship preferably as one wall or" the tank. This tank I one of the water-ballast tanks of the: may be a specially-constructed tank. or in contact with the liquid of ti terior tank the receiver, which may any desired type, is suitably suspen otherwise mounted, and when so moun transmitting medium between the sa: the sound-producing means without i: tically continuous. The medium wit-l tank and with which the transmitter is tact has the important function of ins! the transmitter from noises of local such as traversing the frame and si the ship have heretofore interfered \vi confused the actual signals in instn where the transmittershave been m directly in or on the walls of the ship. Such noises are apparently not'delivcrcd to the liquid of the tank in such a way as to affect my" transmitter suspended therein. The signal-waves, however, striking the side of the ship pass through and into the tank, where they are collected by the transmitter and delivered to the operator, The use of a body of liquid within a casing as a means for receiving'and transferring sound-vibrations imparted to the water without'is also of value in that'it permits of the employment of fresh water or other ncn-corroding liq 'uid' in contact with the transmitter, and it also permits 0f the'pressure to which the transmitter is to be subjected being determined in advance, that it may be constructed toimeet' the requirements of such pressure, and in that it provides the transmitter with a constant pressure instead of a variable one, as is the case where the transmitter is used free or unrestrained in the outer water.

lshall describe the use of my invention in connection with a ship, and for a clearer exposition thereof reference is made to the following drawings, in which Figure 1 illustrates a steam vessel, bow on, with a portion removed to show the forward ballasttank and the electrical transmitter contained therein. Fig. 2' is an end view, partly in cross-section, of the submerged receiving means.

. Referring to the drawings, A represents a tank within a ship; a, the water therein; B, the shell of the vesselj C, the water in which it floats and moves, and 1) an electrical transmitter contained in the water-ballast tank and submerged in the water therein. This transrnitter of the sound or signal vibrations is preferably electrical, and the one shown is that described in my copending application for Letters Patent of the United States, Serial No. 104,297, and need not be specifically described here, it being sufiicient to say that the vibrations communicated to the water by the submerged signaling apparatus are transferred by the water and through the shell of the vessel to the water in the tank and by it to the diaphragms of the transmitter, and these diaphragms receive and electrically transfer them to the receiver E," which may be located in any part of the vesse'. 1n the drawings it is represented as in the pilot-house of the vessel.

Having thus fully described my invention,

I claim and desire to secure by Lotti tions transferred by the water in ship or other vessel floats, and a sound-transmitter in contact with s contained in said tank or other h electrically connected with a receiv 2. In a means for transmitting sot tions through water from a sound station, a liquid sound-transmitting contained in a tank or other holde ship or other vessel in said water, sai being located therein to receive sou tions so transferred by the water in ship' or other vessel floats, and 3. s01 mitter in contact with said liquid CO1 said tank or other holder. I

3. As a means for transmitting sot tions transferred from a sound-sigr tion through water, a comparati soundtransmitting medium conta tank or other holder within a ship vessel in said water, said medium cated to receive and transmit soundtransferred thereto by the said wate the shell of the ship or vessel.

4. As a means for transmitting i transferred from a. sending-statio-r water, a liquid vibration-t ransmittin contained in a holder within a ship vessel in said water and located to re transmitthe vibrations, transferrei water, tl: rough the shell of the shi; Do it. v

5. As a means for transmitting transferred from a sending-statior the water, a receptacle" in contact wi' ter, a liquid vibration-transmitting contained in said receptacle, a $01 mitter in contact with the transmi dium in the receptacle, said medium tween said transmitter and the wall ceptacle in contact with the outer vs receptacle shielding the transmitter outer water.

, ARTHUR J. M] Witnesses:

,F. F. RAYMOND, 2d,

J. M. Dom. 

